/sites/README.txt is unchanged, so still has no instructions regarding .htaccess. Nor does it have upgrade instructions.
/sites/site1/public still doesn’t have an .htaccess file or a symlink to /.htaccess
/sites/site1/private/config-dist.php doesn’t include the new ihu option
/sites/site/public/images still has the old carver ;) (Edit: as does /images. I guess this is for the Welcome to Your Site! theme?)

I upgraded a site on my development server this morning and everything worked fine— like Mr. Soo, all I had to do was update a tag attribute (from sep to seperator). It took me a while to notice the UI improvements, but I love it! I’ll try to get a few more upgrades in tomorrow, and I’ll report back here if I find any trouble.